Zim, Herbert S.  1909-1994. <br/><br/>
Codes & secret writing /  [electronic resource]  
by Herbert S. Zim. 
 - Abridged ed. 
 - New York :  Scholastic Book Services,  c1948, 1975 printing. 
 - 115 p. :  ill. ;  20 cm. 
<br/><br/><label>ISBN: </label> $1.25 0590025058 9780590025058 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography.
<br/><br/><label>LC Class. No.: </label>Z104  / .Z5 1965 
<br/><br/><label>Dewey Class. No.: </label>652.8  / ZIM